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Building Tips and technical articles. => Building techniques => Topic started by: Alan Buck on February 17, 2010, 11:13:10 AM
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Which better or preferred way to put on ployspan. nitrate or butyrate dope. I also have some SIG stix-it to. The wing to be covered is a Stiletto 660
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Yup, just like Ty said. The nitrate seems so be just a little "stickier" for attaching covering. I usually give it another coat of thinned nitrate around the edges, again rubbed in with fingers, before hitting it with the heat gun. Should work out good.
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HI Alan. I use both. It's and either or situation. I like Nitrate as it appears to fill the wood quicker and is generally thicker. I apply 4 or 5 sanded coats to the wood, until it is sort of shiny, then use thinner to dissolve the dope through the covering. I rub it in with my finger tips. Then once it, the dope is dry, I use the heat gun. Very carefully. My first time I melted runs in one wing. Keep the shiny side of the polyspan up. But then you knew that. H^^
Ty,
Have you used it on a "Polywog" type airfoil and if so, did it hold?
Roger V.
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Thanks Ty!
Roger
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If you have a really serious problem with polywog or undercambered airfoils, you might take a look at "Fabric Cement" at your light plane supply store of choice. As I understand it, it's used for the pinked tape over the ribs and such on fabric covered planes. It can be used much as Duco or Ambroid, and I suspect it's very close to Duco (or "Tarzan's Grip") household glue. D>K Steve
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Thanks Steve.
Will try it on a test piece.
Roger V.
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Hi Alan,
I really like NITRATE for my substrates and to attach covering. Bob Hunt turned me on to it many years ago. I usually use Sig, since I can get it when I do make it to the Hobby shop. But I prefer to use Randolph's Non-Tautening Tinted Nitrate. It is my favorite. ;D
Big Bear